在指针声明中星号的位置 [英] Placement of the asterisk in pointer declarations

问题描述

我最近决定，我只是终于学会C / C ++，并有一件事我真的不明白关于指针或更多precisely，它们的定义。

I've recently decided that I just have to finally learn C/C++, and there is one thing I do not really understand about pointers or more precisely, their definition.

如何这些例子：

1. 为int *测试;


2. 为int *测试;


3. 为int *测试;


4. 为int *测试，测试2;


5. 为int *测试，测试2;


6. 为int *测试，测试2;

1. int* test;
2. int *test;
3. int * test;
4. int* test,test2;
5. int *test,test2;
6. int * test,test2;

现在，我的理解，前三种情况都做同样的：测试不是int，而是指向包含一个

Now, to my understanding, the first three cases are all doing the same: Test is not an int, but a pointer to one.

第二组的例子是有点更靠谱。在情况4，测试和测试2将指向一个int，而在5的情况下，唯一的测试是一个指针，而TEST2是一个真正的INT。什么情况下，6？同情况下5？

The second set of examples is a bit more tricky. In case 4, both test and test2 will be pointers to an int, whereas in case 5, only test is a pointer, whereas test2 is a "real" int. What about case 6? Same as case 5?

推荐答案

4，5和6是同样的事情，只有的测试的是一个指针。如果你想两个指针，你应该使用：

4, 5, and 6 are the same thing, only test is a pointer. If you want two pointers, you should use:

int *test, *test2;

，或者甚至更好（让一切清晰）：

Or, even better (to make everything clear):

int* test;
int* test2;

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